I will support any indie developer if the product is worth it and the price is right. I’m currently paying Ivory for Mastodon (iOS) and the experience is top notch. The fact that paid apps for the fediverse are popping up is actually a great sign of interest and critical mass of active users.
On a side note, what are you guys using on iOS? There’s a LOT of options currently, but the four that I’ve been enjoying the most are Memmy, Bean, Lemmios and Avelon. I’m sure in a couple of months we’ll see amazing progress and clearer differentiation from each other.
Liftoff dunks on memmy, it lets you browse the full fediverse and reply using several accounts (in case your main one isn't federated with an instance you're viewing)